First time build, second opinions welcome

I'm looking to build a new computer for about $1200. Mostly it will be used for playing WoW, LOL and SCII. I live in Canada and I'm about 5 minutes away from a memory express so I'm planning on just ordering the parts from memory express since I can just go pick them up at the store. I'll be reusing my current monitory/keyboard/mouse. I have a decent amount of experience mucking around with computers, but I've never built one from scratch myself so I'd appreciate any feedback on my planned build. I'm particularly clueless about what to look for in a case/power supply as I've never had to shop for those myself before.

I decided to go with the Cooler Master HAF 912 case. I also switched the RAM to Corsair Vengeance LP 8GB DDR3 1600MHz CL9 Dual Channel Kit (2 x 4GB), and adedd a 212 evo heatsink. I'm not that confident about overclocking since I've never done it before, but I've never built a computer from scratch before either so I may just give it a shot, and it's not like it adds all that much to the price.

The Hyper 212 EVO only overhangs the RAM slot closest to the CPU socket. Even then, its the fan that's blocking the slot. You can mount the fan higher up on the cooler to fit a large heatsink stick in the closest RAM slot.

If there's a cheaper non-LP set of RAM, you can consider going with that instead. Plus, the heatsinks look nice.